Sreekanth, K. V., Jana, S., Wu, Q. Y. S., Zhao, M., Singh, R., & Teng, J. (2024). Dual‐Phase Singularity at a Single Incident Angle with Spectral Tunability in Tamm Cavities. Advanced Materials, 36(52). Portico. https://doi.org/10.1002/adma.202408098
Abstract:
The phase singularity, a sudden phase change occurring at the reflection zero is widely explored using various nanophotonic systems such as metamaterials and thin film cavities. Typically, these systems exhibit a single reflection zero with a phase singularity at a specific incident angle, particularly at larger angles of incidence (>50 degrees). However, achieving multiple phase singularities at a single incident angle remains a formidable challenge. Here, the existence of a dual‐phase singularity is experimentally demonstrated at a lower incident angle using a tunable Tamm plasmon polariton (TPP) cavity that consists of gold‐coated ultralow‐loss phase change material Sb2S3‐based distributed Bragg reflector. It can excite narrowband TPP resonances from normal incidence to a wide angle of incidence for both s‐ and p‐polarizations of light. Notably, this TPP cavity shows dual‐phase singularity at lower angles of incidence since the excited TPP for s‐ and p‐polarizations exhibits zero reflection at slightly different wavelengths for the same incident angle. A TPP cavity‐based scalable hydrogen sensor is proposed and shows that the dual‐phase singularity can further improve the sensitivity of singular phase‐based sensing approaches. Moreover, spectrally tunable dual‐phase singularity is experimentally demonstrated at a lower incident angle using a metal‐free Tamm cavity.
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Funding Info:
This research / project is supported by the National Research Foundation Singapore - Competitive Research Programme
Grant Reference no. : NRF-CRP26-2021-0004
This research / project is supported by the Ministry of Education - Academic Research Fund Tier 2
Grant Reference no. : T2EP50121-0009
Description:
This is the peer reviewed version of the following article: Sreekanth, K. V., Jana, S., Wu, Q. Y. S., Zhao, M., Singh, R., & Teng, J. (2024). Dual‐Phase Singularity at a Single Incident Angle with Spectral Tunability in Tamm Cavities. Advanced Materials, 36(52). Portico, which has been published in final form at https://doi.org/10.1002/adma.202408098. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.